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US3708221A
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Aspheric lens and method of manufacture
Assignee: Anchor Hocking LLC
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Filing: 1970-04-02
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Granted: 1973-01-02
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Expires: 1990-04-02
Abstract
Abstract An aspheric lens is made with an aspheric curvature on its frontal surface wherein the curvature is defined in the X-Y coordinate system by a particular relationship in accordance with the index of refraction, heighth, focal distance and radius of back surface parameters.
Inventors
- 👤 H Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:43
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/04; F; F21; F21S; F21S41/00; F21S41/20; F21S41/25; F21S41/255; F21S41/275; F21V; F21V5/00; F21V5/04; F21V5/045
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
187 words
An aspheric lens having a frontal surface and a back surface, said frontal surface having an aspheric curvature which produces paths of light parallel to its optical axis from the rays of light passing therethrough with the emitted light being concentrated and having minimal chromatic aberration, said curvature being defined in the X-Y coordinate system by B1 being equal to (X1(COT(A6)) + Y1-J1 + D1(TAN(A4)))/(TAN(A4) + COT(A6)) and C1 being equal to J1 + (B1-D1)( TAN(A4)) wherein N1 is the index of refraction, H1 is the heighth, X1 is the X value of the previous calculated point and Y1 is Y value of the previous calculated point, F1 is the focal distance from the focal point to said back surface, R1 is the radius of the back surface, G1 4(2 R1F1 + F12), A1 ATN(H1/F1), E1 2(R1+F1)(COS(A1)), E2 E12 - G1, M5 (E1 - square root E2) (0.5), J1 M5(SIN(A1)), D1 (J1-H1)(TAN(A1)), A2 ASN (J1/r1), A7 A1 + A2, A3 ASN(SIN(A7)/N1), A4 A3- A2, A5 ATN(SIN(A4)/(N1 - COS(A4))), A6 A4 + A5, B1 X value of point being calculated; and C1 Y value of point being calculated.
Claim 2
Dependent Claim
187 words
An aspheric lens having a frontal surface and a back surface, said frontal surface having an aspheric curvature which produces paths of light parallel to its optical axis from the rays of light passing therethrough with the emitted light being concentrated and having minimal chromatic aberration, said curvature being defined in the X-Y coordinate system by B1 being equal to (X1(COT(A6)) + Y1-J1 + D1(TAN(A4)))/(TAN(A4) + COT(A6)) and C1 being equal to J1 + (B1-D1)( TAN(A4)) wherein N1 is the index of refraction, H1 is the heighth, X1 is the X value of the previous calculated point and Y1 is Y value of the previous calculated point, F1 is the focal distance from the focal point to said back surface, R1 is the radius of the back surface, G1 4(2 R1F1 + F12), A1 ATN(H1/F1), E1 2(R1+F1)(COS(A1)), E2 E12 - G1, M5 (E1 - square root E2) (0.5), J1 M5(SIN(A1)), D1 (J1-H1)(TAN(A1)), A2 ASN (J1/r1), A7 A1 + A2, A3 ASN(SIN(A7)/N1), A4 A3- A2, A5 ATN(SIN(A4)/(N1 - COS(A4))), A6 A4 + A5, B1 X value of point being calculated; and C1 Y value of point being calculated.
Claim 3
Dependent Claim
21 words
An aspheric lens as set forth in claim 1 wherein said back surface is convex being the segment of a sphere.
Claim 4
Dependent Claim
30 words
An aspheric lens as set forth in claim 2 wherein said frontal surface includes a peripheral substantially planar rim around said aspheric curvature, and said peripheral rim having parallel flutes.
Claim 5
Dependent Claim
30 words
An aspheric lens as set forth in claim 1 wherein said frontal surface includes a peripheral substantially planar rim around said aspheric curvature, and said peripheral rim having parallel flutes.
Claim 6
Dependent Claim
15 words
An aspheric lens as set forth in claim 1 wherein said back surface is planar.
Claim 7
Dependent Claim
26 words
An aspheric lens as set forth in claim 5 wherein a portion of said back surface has parallel flutes to create an auxiliary spread light pattern.
Claim 8
Dependent Claim
28 words
An aspheric lens as set forth in claim 6 wherein said flutes are disposed in a circular area having its center on said optical axis of said lens.
Claim 9
Dependent Claim
53 words
An aspheric lens as set forth in claim 6 wherein said back surface includes a circular area having its center on said optical axis of said lens, said circular area being free of flutes, a peripheral ring shaped area being around said central area, and said flutes being in said ring shaped area.
Claim 10
Dependent Claim
42 words
An aspheric lens as set forth in claim 6 wherein said back surface includes a central area centered on said optical axis of said lens, and said flutes being in parallel portions adjacent to and on two sides of said central area.
Claim 11
Dependent Claim
71 words
An aspheric lens as set forth in claim 6 wherein each flute is defined in cross-section by a radius r1 h1/SIN(A4) and a chord heighth h2 ( r1 - 0.5 Square Root 4(r1)2 - (2h1)2), wherein N1 is the index of refraction, h1 is the half heighth of the flute, a is the degrees spread, a1 a pi /360, a2 ASN(SIN(a1)/N1), a3 ATN(SIN(a2)/N1 - COS(a2)) , and a4 a2 + a3.
Claim 12
Dependent Claim
47 words
An aspheric lens as set forth in claim 1 in combination therewith, a housing having an open end, a point source of light in said housing, said lens closing said open end of said housing, and said housing being connected in the headlight system of a vehicle.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |